Yes, but the home-made engine before that worked fairly well. The whole message they are communicating (to me) is : we've our lesson and will control the scale.

I think the Genome problem was a case of over-reaching (too big a project for the team size and experience) and poor project management…remember they started with Gamebryo and apparently threw that out and built up from scratch (there is some disagreement over the exact details and whether any part of GameBryo remains).